An analysis of a running system shows that the system is frequently being interrupted to execute program code related to interrupts. How does the CPU know when it must execute this code?
A) The CPU periodically checks each device.
B) IRQ information is carried by the control bus.
C) The CPU is informed by the data bus.
D) The cache controller generates a signal.

Question

Quizplus · Accepted Answer

The CPU knows when it must execute interrupt-related code because IRQ (Interrupt Request) information is carried by the control bus. This allows devices to signal the CPU directly that they need attention, without the CPU having to periodically check each device.

An Analysis of a Running System Shows That the System